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Pinpoint Test O: One Turn Signal/Hazard Lamp Is Inoperative/Always On




Turn Signal and Hazard Lamps

Pinpoint Test O: One Turn Signal/Hazard Lamp Is Inoperative/Always On

Refer to Wiring Diagram Set 90 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid), Turn Signal/Stop/Hazard Lamps for schematic and connector information. Diagrams By Number

Normal Operation

When the Smart Junction Box (SJB) detects the multifunction switch is in the LH TURN position, the SJB provides voltage to the LH front turn lamp and LH rear turn lamp. When the SJB detects the multifunction switch is in the RH TURN position, the SJB provides voltage to the RH front turn lamp and the RH rear turn lamp.





This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Bulb holder
- Rear lamp assembly
- SJB


PINPOINT TEST O: ONE TURN SIGNAL/HAZARD LAMP IS INOPERATIVE/ALWAYS ON

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

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O1 CHECK THE STOPLAMPS

- Apply and release the brake pedal while observing the stoplamps.
- Do the stoplamps operate correctly?

Yes
GO to O2.

No
REFER to Stoplamps Special Tool(s) Used With Diagnostics.

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O2 DETERMINE IF A TURN LAMP IS ALWAYS ON

- Ignition ON.
- Monitor the turn lamps while placing the multifunction switch in the RH TURN and then LH TURN positions.
- Is any turn lamp always on?

Yes
GO to O3.

No
GO to O4.

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O3 CHECK THE SJB TURN LAMP OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

- Ignition OFF.
- Disconnect: SJB C2280f (Front Turn Lamp).
- Disconnect: SJB C2280c (Rear Turn Lamp).
- Ignition ON.
- Does the turn lamp in question continue to illuminate?

Yes
REPAIR circuit CLS21 (BU/GN) (LH front), circuit CLS25 (YE/VT) (RH front), circuit CLS23 (GY/OG) (LH rear) or circuit CLS24 (BN/WH) (RH rear) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.

No
GO to O10.

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O4 USE THE RECORDED DTCs FROM THE SJB SELF-TEST

- Check the recorded results from the SJB on-demand self-test.
- Is DTC B2049, B2051, B2A27 or B2A29 present?

Yes
GO to O5.

No
GO to O8.

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O5 CHECK FOR VOLTAGE TO THE TURN LAMP (OPEN DTC PRESENT)

- Ignition OFF.
- Disconnect: Inoperative Turn Lamp.
- Activate the hazard flasher lamp function.
- For a front lamp, measure the voltage between the LH front turn lamp C1023-3, circuit CLS21 (BU/GN), harness side and ground; or between the RH front turn lamp C1043-3, circuit CLS25 (YE/VT), harness side and ground.




- For a Milan rear lamp, measure the voltage between the LH rear turn lamp C413-3, circuit CLS23 (GY/OG), harness side and ground; or between the RH front turn lamp C416-3, circuit CLS24 (BN/WH), harness side and ground.




- For an MKZ rear lamp, measure the voltage between the LH rear turn lamp C4139-1, circuit CLS23 (GY/OG), harness side and ground; or between the RH front turn lamp C4140-1, circuit CLS24 (BN/WH), harness side and ground.




- Does the voltage alternate from 0 volts to greater than 10 volts?

Yes
GO to O6.

No
GO to O7.

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O6 CHECK FOR VOLTAGE TO THE FRONT TURN LAMP OR SIGNAL MIRROR USING THE CONNECTOR GROUND

- For a front lamp, measure the voltage between the LH front turn lamp C1023-3, circuit CLS21 (BU/GN), harness side and the LH front turn lamp C1023-1, circuit GD123 (BK/GY), harness side; or between the RH front turn lamp C1043-3, circuit CLS25 (YE/VT), harness side and the RH front turn lamp C1043-1, circuit GD121 (BK/YE), harness side.




- For a Milan rear lamp, measure the voltage between the LH rear turn lamp C413-3, circuit CLS23 (GY/OG), harness side and the LH rear turn lamp C413-1, circuit GD171 (BK/GY), harness side; or between the RH front turn lamp C416-3, circuit CLS24 (BN/WH), harness side and the RH front turn lamp C416-1, circuit GD171 (BK/GY), harness side.




- For an MKZ rear lamp, measure the voltage between the LH rear turn lamp C4139-1, circuit CLS23 (GY/OG), harness side and the LH rear turn lamp C4139-2, circuit GD171 (BK/GY), harness side; or between the RH front turn lamp C4140-1, circuit CLS24 (BN/WH), harness side and the RH front turn lamp C4140-2, circuit GD171 (BK/GY), harness side.




- Does the voltage alternate from 0 volts to greater than 10 volts?

Yes
For a front lamp, INSTALL a new bulb holder. TEST the system for normal operation.

For a Milan rear lamp, INSTALL a new bulb holder. TEST the system for normal operation.

For an MKZ rear lamp, INSTALL a new rear lamp assembly. REFER to Rear Lamp Assembly [1][2]Rear Lamp Assembly. TEST the system for normal operation.

No
REPAIR circuit GD123 (BK/GY) (LH front), circuit GD121 (BK/YE) (RH front) or circuit GD171 (BK/GY) (LH or RH rear) for an open. TEST the system for normal operation.

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O7 CHECK THE SJB TURN LAMP OUTPUT CIRCUIT FOR AN OPEN

- Turn the hazard lamp function off.
- Disconnect: SJB C2280f (Front Turn Lamp).
- Disconnect: SJB C2280c (Rear Turn Lamp).
- For a front lamp, measure the resistance between the LH front turn lamp C1023-3, circuit CLS21 (BU/GN), harness side and the SJB C2280f-21, circuit CLS21 (BU/GN), harness side; or between the RH front turn lamp C1043-3, circuit CLS21 (BU/GN), harness side and the SJB C2280f-23, circuit CLS25 (YE/VT), harness side.




- For a Milan rear lamp, measure the voltage between the LH rear turn lamp C413-3, circuit CLS23 (GY/OG), harness side and the SJB C2280c-21, circuit CLS23 (GY/OG), harness side; or between the RH front turn lamp C416-3, circuit CLS24 (BN/WH), harness side and the SJB C2280c-19, circuit CLS24 (BN/WH), harness side.




- For an MKZ rear lamp, measure the voltage between the LH rear turn lamp C4139-1, circuit CLS23 (GY/OG), harness side and the SJB C2280c-21, circuit CLS23 (GY/OG), harness side; or between the RH front turn lamp C4140-1, circuit CLS24 (BN/WH), harness side and the SJB C2280c-19, circuit CLS24 (BN/WH), harness side.




- Is the resistance less than 5 ohms?

Yes
GO to O10.

No
REPAIR circuit CLS21 (BU/GN) (LH front), circuit CLS25 (YE/VT) (RH front), circuit CLS23 (GY/OG) (LH rear) or circuit CLS24 (BN/WH) (RH rear) for an open. TEST the system for normal operation.

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O8 ISOLATE THE BULB HOLDER OR REAR LAMP ASSEMBLY AS THE CAUSE OF THE SHORT TO GROUND

- Ignition OFF.
- Disconnect: Inoperative Turn Lamp.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB Self-Test.
- Clear the DTCs and repeat the self-test (required to enable the turn lamp output driver if DTC B106E is present).
- Activate the hazard flasher lamp function.
- For a front lamp, measure the voltage between the LH front turn lamp C1023-3, circuit CLS21 (BU/GN), harness side and ground; or between the RH front turn lamp C1043-3, circuit CLS25 (YE/VT), harness side and ground.




- For a Milan rear lamp, measure the voltage between the LH rear turn lamp C413-3, circuit CLS23 (GY/OG), harness side and ground; or between the RH front turn lamp C416-3, circuit CLS24 (BN/WH), harness side and ground.




- For an MKZ rear lamp, measure the voltage between the LH rear turn lamp C4139-1, circuit CLS23 (GY/OG), harness side and ground; or between the RH front turn lamp C4140-1, circuit CLS24 (BN/WH), harness side and ground.




- Does the voltage alternate from 0 to greater than 10 volts?

Yes
INSTALL a new bulb holder or rear lamp assembly in question. TEST the system for normal operation.

No
GO to O9.

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O9 CHECK THE SJB TURN LAMP OUTPUT CIRCUIT FOR A SHORT TO GROUND

- Turn the hazard lamp function off.
- Ignition OFF.
- Disconnect: SJB C2280f (Front Turn Lamp).
- Disconnect: SJB C2280c (Rear Turn Lamp).
- For a front turn lamp, measure the resistance between the SJB C2280f-21 (LH turn lamp), circuit CLS21 (BU/GN), harness side and ground; or between the SJB C2280f-23 (RH turn lamp), circuit CLS25 (YE/VT), harness side and ground.




- For a rear turn lamp, measure the resistance between the SJB C2280c-21 (LH turn lamp), circuit CLS23 (GY/OG), harness side and ground; or between the SJB C2280c-19 (RH turn lamp), circuit CLS24 (BN/WH), harness side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to O10.

No
REPAIR circuit CLS21 (BU/GN) (LH front), circuit CLS25 (YE/VT) (RH front), circuit CLS23 (GY/OG) (LH rear) or circuit CLS24 (BN/WH) (RH rear) for a short to ground. After the repair:

If no DTCs are present, TEST the system for normal operation.

If DTC B106E is present, CLEAR the DTCs and REPEAT the self-test (required to enable the turn lamp output driver if DTC B106E is present). TEST the system for normal operation.

If DTC B106F is present, INSTALL a new SJB. REFER to Multifunction Electronic Modules Service and Repair. TEST the system for normal operation.

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O10 CHECK FOR CORRECT SJB OPERATION

- Ignition OFF.
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new SJB. REFER to Multifunction Electronic Modules Service and Repair. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

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